[ARM] 3551/1: S3C24XX: PM code failes to compile with CONFIG_DCACHE_WRITETHROUGH

Patch from Ben Dooks

If CONFIG_CPU_DCACHE_WRITETHOUGH is set, then the
S3C24XX PM code fails to compile, as there is no
need to flush the D-cache, the flush function
arm920_flush_kern_cache_all() is not compiled.

Fix the code to not use this if the config is set.

Signed-off-by: Ben Dooks <ben-linux@fluff.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

2 files changed, 6 insertions, 0 deletions

diff --git a/arch/arm/mach-s3c2410/pm.c b/arch/arm/mach-s3c2410/pm.c
index fe57d966a34d..43e9a550a203 100644
--- a/arch/arm/mach-s3c2410/pm.c
+++ b/arch/arm/mach-s3c2410/pm.c
@@ -58,7 +58,11 @@ unsigned long s3c_pm_flags;
 
 /* cache functions from arch/arm/mm/proc-arm920.S */
 
+#ifndef CONFIG_CPU_DCACHE_WRITETHROUGH
 extern void arm920_flush_kern_cache_all(void);
+#else
+static void arm920_flush_kern_cache_all(void) { }
+#endif
 
 #define PFX "s3c24xx-pm: "
 
diff --git a/arch/arm/mach-s3c2410/sleep.S b/arch/arm/mach-s3c2410/sleep.S
index 73de2eaca22a..5f6761ed96b2 100644
--- a/arch/arm/mach-s3c2410/sleep.S
+++ b/arch/arm/mach-s3c2410/sleep.S
@@ -66,7 +66,9 @@ ENTRY(s3c2410_cpu_suspend)
         @@ flush the caches to ensure everything is back out to
         @@ SDRAM before the core powers down
 
+#ifndef CONFIG_CPU_DCACHE_WRITETHROUGH
         bl      arm920_flush_kern_cache_all
+#endif
 
         @@ prepare cpu to sleep